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Measurement of inclusive jet charged-particle fragmentation functions in Pb+Pb collisions at √sNN=2.76TeV with the ATLAS detector
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Measurement of inclusive jet charged-particle fragmentation functions in Pb+Pb collisions at √sNN=2.76TeV with the ATLAS detector

G. Aad, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, M. Abolins, O.S. AbouZeid, H. Abramowicz, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol.739, pp.320-342
02/12/2014

Abstract

Measurements of charged-particle fragmentation functions of jets produced in ultra-relativistic nuclear collisions can provide insight into the modification of parton showers in the hot, dense medium created in the collisions. ATLAS has measured jets in sNN=2.76TeV Pb+Pb collisions at the LHC using a data set recorded in 2011 with an integrated luminosity of 0.14 nb <sup>-1</sup> . Jets were reconstructed using the anti-k <sub>t</sub> algorithm with distance parameter values R=0.2, 0.3, and 0.4. Distributions of charged-particle transverse momentum and longitudinal momentum fraction are reported for seven bins in collision centrality for R=0.4 jets with pTjet>100GeV. Commensurate minimum p <sub>T</sub> values are used for the other radii. Ratios of fragment distributions in each centrality bin to those measured in the most peripheral bin are presented. These ratios show a reduction of fragment yield in central collisions relative to peripheral collisions at intermediate z values, 0.04≲z≲0.2, and an enhancement in fragment yield for z≲0.04. A smaller, less significant enhancement is observed at large z and large p <sub>T</sub> in central collisions.
url
https://doi.org/10.1016/j.physletb.2014.10.065View
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